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In genetics, typically an individual that has one recessive mutant allele for some defective condition that is “masked” by a dominant normal allele at the same locus, i.e., an individual that is heterozygous for a recessive harmful allele and a dominant normal allele; the phenotype is normal, but the individual passes the defective (recessive) allele to half of its offspring.
Publication Source: Food and Agricultural Organization of the United Nations (FAO)
Publication Date: 1999
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